... acid soluble rateMax 0.2%Bulk density1.85g/cm3 For paving stone:1Typecobble & pebble (river stone)2Material100% natural stone3Usagelandscaping ... , paving, building, home decoration4Product class rangeunpolished pebble(super class, first class, ... in this line for 18 years Beautiful color pebble as paving stone